Abstract: In a device of the plasma scalpel type (40, 41) including at least two spaced-apart electrodes (21, 22) subjected to electrical potential differences such that electric arcs take place therebetween, together with structures for producing at least one fluid flow passing through a region of space where said electric arcs occur, the potential differences being alternating potential differences at medium or high frequency, the ends of said electrodes are substantially filiform and forming an angle therebetween which is preferably acute, and a voltage step-up transformer is incorporated therein in order to deliver the alternating potential differences, with the fluid flows arriving from within the angle or along at least one of said electrodes.